Download TC-9102 Applications Application Note

TC-9102 Applications
7
The controller controls fan coil heating or cooling from a
wall-mounted room command module (TM-9100) or from a return-air
sensor. Heating and cooling is controlled in sequence to achieve
setpoint. If the TM-9100 is mounted inside the fan coil control panel
as in a typical hotel-room unit, the sensor must be mounted in the
return-air intake.
Note:
The TM-9100, a Negative Temperature Coefficient (NTC)
sensor, is the only sensor used with the TC-9102 controller.
Systems using hot and chilled water for temperature control may be
arranged in a 2-, 3-, or 4-pipe configuration. The TC-9102 applies to
the 4-pipe configuration. This configuration requires different numbers
of valves and different control sequences. If the fan coil has separate
heating and cooling coils, separate valves are used. When a common
coil is used for heating and cooling, then use the fan coil application in
the UNT controller as described in the UNT Applications Application
Note (LIT-6375100) in the HVAC PRO User’s Manual (FAN 637.5).
Heating Valve
Heating Coil
4-Pipe.....
Cooling Valve
Cooling Coil
tccoils
Figure 4: 4-Pipe System Application
N2 Dial Capability Upon Alarm Detection
When the controller is connected to a remote N2 Bus, supervised by a
Metasys Network telephone-linked Metasys N2 Dialer
(NU-NDM101-0), the following controller-alarm conditions start an
automatic dial:
•
window open (not intended for use as a security system)
•
Low-Limit mode
•
High- or Low-Alarm Limit violation of room temperature when
the Supervisory System sets alarm limits
When any of these alarm conditions occurs, the N2 Dialer detects the
alarm and connects the remote N2 Bus to the Metasys Network. When
the telephone line connection is established, the controller alarm status
resets automatically. The controller then reports other alarm conditions
as they occur. Refer to the N2 Dial Application Application Note
(LIT-6375150) in this manual and the N2 Dialer Module (NDM)
Technical Bulletin (LIT-6363065) in the Metasys Application Specific
Controller Technical Manual (FAN 636.3) for more information.